Uncovered bear running (4)
I believe the answer is:
bare
'uncovered' is the definition.
(similar in meaning)
'bear running' is the wordplay.
'running' indicates an anagram (the letters run around to different places).
'bear' with letters rearranged gives 'BARE'.
(Other definitions for bare that I've seen before include "Unclad" , "Denuded" , "Stark - naked" , "State of deciduous tree in winter" , "Naked or empty" .)